SmogRank / United States / Missouri / University City
University City, month by month
University City has a measured daily mean on 1,377 days since 1 January 2023. Its worst month was June 2023, at 64 US AQI (15.9 µg/m³), 358th of 1,603 cities on that month's world ranking. Its cleanest was April 2024, at 29 US AQI (5.3 µg/m³). 2025 averaged 41 US AQI (7.3 µg/m³), against 39 US AQI (7.0 µg/m³) in 2024.
Every month since 2023
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
University City's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 6415.9 µg/m³ | 358thof 1,603 | Eastern United States and Canada, June and July 2023 |
| August 2023 | 5410.6 µg/m³ | 509thof 1,980 | – |
| September 2023 | 529.8 µg/m³ | 631stof 2,176 | – |
| July 2023 | 529.4 µg/m³ | 720thof 1,432 | United States and Canada, July 2023 Eastern United States and Canada, June and July 2023 |
| June 2025 | 519.1 µg/m³ | 1,571stof 2,508 | – |
| May 2023 | 509.0 µg/m³ | 664thof 1,600 | – |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
University City's worst days
| Day | US AQI | Episode |
|---|---|---|
| 28 Jun 2023 | 15561.5 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 15 Mar 2025 | 15358.4 µg/m³ | Eastern United States, March 2025 |
| 1 Aug 2025 | 10336.2 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 20 Jul 2026 | 8929.6 µg/m³ | Northern United States and Canada, July 2026 |
| 21 Aug 2023 | 8828.8 µg/m³ | – |
| 16 Jul 2023 | 8426.9 µg/m³ | United States and Canada, July 2023 |
| 23 Aug 2023 | 7924.0 µg/m³ | – |
| 7 Jun 2025 | 7723.1 µg/m³ | – |
| 30 Jun 2026 | 7622.7 µg/m³ | – |
| 7 Jun 2023 | 7622.6 µg/m³ | – |
Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, University City, United States, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/university-city/history (accessed 12 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
University City now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).